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2009 MARCH–APRIL No. 367
April 23, 2009 [posted]

NLM® Classification 2009 Edition Now Available

graphical image of the letter T

T he NLM Classification, available online at //, incorporates all additions and changes to the schedules and index from April 2008 through March 2009. The PDF version will be updated with 2009 classification data by May 7, 2009.

The W (General Medicine. Health Professions), WZ (History of Medicine. Medical Miscellany), and 19th Century schedules were the major areas of focus for the 2009 edition, along with Table G.

The header titles of the W and WZ schedules were augmented to better reflect the contents of the schedule:

Some W, WZ, and 19th Century class number captions and notes were revised to better reflect the scope of the number. For example:

Table G (geographic breakdown) is now permitted with W 84.6 Primary health care.

Class Numbers Added and Canceled

Seventeen new class numbers were added to the main schedules. For a complete list of the new class numbers, go to // Four new class numbers were added to the 19th Century schedule. One class number was canceled.

Class Numbers Added — 2009

New Number Class Name Former Number

General Medicine. Health Professions

W 20.55.E7 Ethics in research W 20.5
W 84.4 Quality of health care (General) (Table G) W 84
W 84.41 General coverage (Not Table G) W 84.1
W 84.61 [Primary health care] General coverage (Not Table G) W 84.6
W 85.2 Patient satisfaction W 85
W 85.4 Patient rights. Advocacy W 85

Practice of Medicine

WB 107 Wilderness medicine None
WB 113 Integrative medicine None

Respiratory System

WF 653 Lung injury None


WY 100.7 Evidence-based nursing None

History of Medicine. Medical Miscellany

WZ 24 Archives (General) None
WZ 80.5.H8 Hispanic Americans WZ 80
WZ 112.5.G9 Gynecologists WZ 112
WZ 112.5.M3 Midwives. Nurse midwives WZ 112
WZ 112.5.O2 Obstetricians WZ 112
WZ 135 [Collective biography (by period)] 21st century None
WZ 331 Medicine, as depicted in art WZ 330

Class Numbers Canceled — 2009

Canceled Number Class Name Now Classed in

History of Medicine. Medical Miscellany

WZ 332 Anniversaries and special events [Number never used at NLM]

19th Century Schedule Additions

New Number Class Name Former Number
QTB Diet None
W 26 Equipment and supplies None
WOB Military surgery None
WYA Military nursing None

Table G (Geographic Notations)

A new Table G Section was created for historical jurisdictions or entities that existed in the past and whose former territories are not encompassed by a single present day country. Some of the jurisdictions listed in this section were removed from the Obsolete Table G Notations section. Some cutters of present day countries are also being used for the historical lands even though these are not one-to-one matches. For example, GR9, the cutter assigned to Russia (Federation), is also assigned to the USSR and Russia (Pre-1917).


GR9—Russia (Pre-1917)

Other Table G changes

DA6—Antigua and Barbuda [Barbuda was added]
JM1—Macau [spelling changed from Macao]
M1—International agencies (General or not listed below) ["1" added to notation]

Two cross-references were added:

Other Changes to the Schedule

Class number captions were also revised in other schedules. For example:

Instructional notes were added or modified to clarify classification practices as needed, e.g., a note was added to WA 292: Classify works on wilderness medicine in WB 107.

Changes to the Index

Eighty-one new index entries were created of which thirty-four are from the 2009 MeSH®; the remainder are MeSH terms from previous years. All main index headings are linked to the 2009 vocabulary in the MeSH Browser.

Numerous main index entries and cross references were modified to reflect changes in the MeSH vocabulary. In particular, some major categories of index terms affected by MeSH changes were:

Physiology terms that changed to Physiological Phenomena, e.g.,
        Child Nutrition Physiology to Child Nutritional Physiology Phenomena

Prescription related terms, e.g.,
       Drugs, Non-Prescription changed to Nonprescription Drugs

All index entries pertaining to the aforementioned schedule additions and changes were modified.

Index entries with Library of Congress (LC) H schedule numbers were reviewed for accuracy.

To learn more about the NLM Classification, see the Fact Sheet.

By Sharon R. Willis
Cataloging Section, Technical Services Division

Willis SR. NLM® Classification 2009 Edition Now Available. NLM Tech Bull. 2009 Mar-Apr;(367):e19.

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